An ammonia tank tail gas deodorization device

Abstract

The utility model discloses an ammonia gas tank tail gas deodorization device, and ammonia water tank is connected through baffle demister, quartz sand filter and water washing system, and the bottom of water washing system is connected through tail water tank and blow -off tower, and blow -off tower is connected through tail gas treatment tank and dehumidifier, and dehumidifier is connected with tail gas discharge tower, and the top of water washing system is connected through dehumidifier and tail gas discharge tower. The utility model discloses, through the classification processing with ammonia gas separation from tail gas, then through the method of physical absorption and chemical reaction to ammonia gas absorption, realizes the purpose of purifying tail gas.

Description

Technical Field

[0001] This utility model belongs to the field of fermentation tail gas treatment technology, specifically relating to an ammonia tank tail gas deodorization device. Background Technology

[0002] Microbial fermentation requires a large amount of nitrogen-containing organic matter as a nitrogen source to maintain normal life activities. This nitrogen-containing organic matter includes proteins, amino acids, urea, and nucleic acids. These organic compounds are decomposed by microorganisms, releasing amino groups, which are then denitrified to produce free ammonia. In some processes, such as composting and biogas fermentation, ammonia serves as a source of nitrogen nutrients, aiding subsequent plant absorption. In traditional fermented foods like soy sauce, fermented black beans, and fish sauce, a moderate ammonia flavor is a key component. However, in many cases, the pungent smell of ammonia can corrode equipment, and direct emissions pollute the environment. Confining the ammonia produced during fermentation to the fermentation equipment can negatively impact the normal life activities of microorganisms, inhibiting fermentation or posing food safety risks. Therefore, it is necessary to extract the ammonia produced during microbial fermentation and treat it through deodorization and other environmentally friendly processes.

[0003] Chinese patent CN223221240U discloses an ammonia tail gas treatment device. The lower end of the tail gas absorption tower is connected to an ammonia water tank via a pipeline. The upper end of the ammonia water tank is equipped with a tail gas tank. The top of the tail gas tank is connected to a tail gas fan via a pipeline. The output end of the tail gas fan is connected to a scrubbing tower. The liquid at the bottom of the scrubbing tower is transported to the scrubbing tank for secondary absorption via a pipeline and a second transfer pump. An adsorption tank is installed on the top of the scrubbing tank. This device solves the problem of ammonia-containing tail gas being randomly discharged into the atmosphere during the production process, polluting the environment. The designed tail gas absorption device fully absorbs the ammonia and turns it into ammonia water, which can be returned to the chemical production system as a raw material for reuse, saving costs. The ammonia-containing tail gas after absorption and treatment meets the emission standards. It has low treatment costs, is safe and environmentally friendly, has high economic value, greatly reduces production costs, and improves economic efficiency.

[0004] Chinese patent CN218249039U discloses an industrial ammonia tail gas detection and treatment device. The main body has an internal filter chamber for storing the tail gas for later treatment. An ammonia sensor is located on the inner wall of the filter chamber to detect the concentration of ammonia within it. This treatment device uses the ammonia sensor in conjunction with the filter assembly to continuously filter the tail gas inside the filter chamber, preventing ammonia leakage. In the recovery stage after filtration, a heating component can reduce the ammonia in the water, allowing the factory to directly recover the ammonia, improving processing efficiency and preventing ammonia leakage during transportation.

[0005] However, current ammonia tail gas treatment devices are all designed for ammonia generated in the chemical industry. Ammonia produced during microbial fermentation has a low concentration and flow rate, and the flow rate fluctuates with the fermentation stage. Furthermore, the ammonia tail gas produced by microbial fermentation also contains large amounts of water vapor, CO2, trace amounts of organic acids, microbial cell debris, and soluble organic matter. Therefore, conventional industrial ammonia tail gas treatment methods are too costly to operate. Physical adsorption methods suffer from problems such as adsorbent agglomeration and biological packing material mold growth. Membrane separation technology is expensive, and microbial cell debris easily forms a gel layer on the membrane surface, clogging the membrane pores and leading to decreased membrane flux, requiring frequent cleaning. Therefore, it is necessary to provide a simple, inexpensive, and stable method suitable for treating low-concentration ammonia tail gas. Summary of the Invention

[0006] To address the aforementioned technical problems, this utility model provides an ammonia tank exhaust gas deodorization device, which separates ammonia from the exhaust gas through staged treatment, and then absorbs the ammonia through physical absorption and chemical reaction methods to achieve the purpose of purifying the exhaust gas.

[0007] To achieve the above objectives, this utility model provides an ammonia tank tail gas deodorization device. The ammonia tank is connected to a water washing system via a baffle plate demister and a quartz sand filter. The bottom of the water washing system is connected to a stripping tower via a tail water tank. The stripping tower is connected to a dehumidifier via a tail gas treatment tank. The dehumidifier is connected to a tail gas emission tower. The top of the water washing system is connected to the tail gas emission tower via a dehumidifier.

[0008] Preferably, the washing system consists of multiple washing tanks connected in series, and each washing tank is equipped with an air supply pipe, a first sprayer, and a first float valve.

[0009] More preferably, the first sprayer is connected to the spray water storage tank via an automatic valve; the first float valve is connected to the automatic valve.

[0010] More preferably, the tail end of the gas transmission pipe is provided with multiple small holes, the small holes being 3-5cm away from the bottom of the gas transmission pipe, and having an inner diameter of 2-5mm.

[0011] Preferably, the dehumidifier is equipped with a multi-layer drawer-type activated carbon tank.

[0012] Preferably, the exhaust gas treatment tank is connected to the concentrator pipeline, and the concentrator is connected to the ammonia tank pipeline.

[0013] Preferably, the exhaust gas treatment tank is equipped with a second sprayer and a second float valve; the second sprayer is connected to the spray water storage tank pipeline; and the second float valve is connected to the control valve of the second sprayer.

[0014] Preferably, the bottom of the stripping tower is connected to the spray water storage tank pipeline.

[0015] The beneficial effects of this invention are as follows: This invention utilizes a baffle plate demister, a quartz sand filter, a water washing system, a stripping tower, and a tail gas treatment tank to remove water vapor, remove impurities, and dissolve and adsorb ammonia in the ammonia-containing tail gas generated during fermentation. This multi-dimensional treatment of the fermentation tail gas effectively treats water-soluble gases such as ammonia while preventing water vapor and microbial cell debris from clogging the device, thus improving the tail gas treatment efficiency and depth. It is suitable for low-concentration, fluctuating-flow-rate ammonia tail gas with high impurity content generated during microbial fermentation, achieving environmentally friendly treatment of fermentation tail gas and reducing its environmental impact. Simultaneously, the absorbed ammonia can be recycled and, after a series of treatments, can be used as a nitrogen source in microbial culture, improving nitrogen resource utilization. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; in the figure, 1 is an ammonia tank, 2 is a baffle plate demister, 3 is a quartz sand filter, 4 is a water washing tank, 5 is a first sprayer, 6 is a first float valve, 7 is an automatic valve, 8 is a gas supply pipe, 9 is a spray water storage tank, 10 is a tailwater tank, 11 is a stripping tower, 12 is a tail gas treatment tank, 13 is a second sprayer, 14 is a dehumidifier, 15 is a tail gas emission tower, 16 is a concentrator, and 17 is a second float valve. Detailed Implementation

[0017] The technical solution of this utility model will be further explained below with reference to the accompanying drawings and specific embodiments. It is worth noting that the following embodiments are only preferred embodiments of this utility model and should not be construed as limiting this utility model. The protection scope of this utility model should be determined by the content of the claims. Modifications or substitutions made by those skilled in the art to the technical solution of this utility model without creative effort all fall within the protection scope of this utility model.

[0018] Example 1 like Figure 1As shown, an ammonia tank exhaust gas deodorization device is described. The ammonia tank 1 is connected to a water washing system via a baffle plate demister 2 and a quartz sand filter 3. The fermentation exhaust gas containing ammonia stored in the ammonia tank 1 undergoes initial settling and cooling. Then, water vapor is removed by the baffle plate demister 2, and small particulate impurities are removed by the quartz sand filter 3 to prevent clogging of subsequent treatment devices. The exhaust gas is then introduced into the water washing system, where water is used to absorb and remove the ammonia. The bottom of the water washing system is connected to a stripping tower 11 via a tailwater tank 10. The stripping tower 11 is connected to a dehumidifier 14 via an exhaust gas treatment tank 12. The dehumidifier 14 is connected to the exhaust gas discharge... The ammonia gas is connected to the exhaust tower 15. After passing through the water washing system, the ammonia gas dissolves in the aqueous solution. The aqueous solution is then collected in the tailwater tank 10 and subsequently pumped into the stripping tower 11. The ammonia gas is stripped from the aqueous solution and enters the tail gas treatment tank 12 for further dissolution and absorption. The tail gas after ammonia removal enters the dehumidifier 14 to remove excess moisture and is finally discharged through the tail gas emission tower 15. The discharged tail gas does not contain odorous gases such as ammonia, nor does it contain impurities such as organic acids or microbial cell fragments. The top of the water washing system is connected to the tail gas emission tower 15 via the dehumidifier 14, which dehumidifies the tail gas after multi-stage treatment by the water washing system and then discharges it directly.

[0019] Preferably, the water washing system consists of multiple water washing tanks 4 connected in series, which can perform multi-stage water washing on the exhaust gas to improve the removal efficiency of ammonia and other water-soluble gases. The water washing tank 4 is equipped with a gas delivery pipe 8, a first sprayer 5, and a first float valve 6. The end of the gas delivery pipe 8 is located below the liquid level in the water washing tank 4, so that the exhaust gas delivered through the gas delivery pipe 8 can fully contact the aqueous solution in the tank, improving the contact efficiency of water-soluble gases such as ammonia, thereby improving the exhaust gas treatment efficiency. The first sprayer 5 can replenish the aqueous solution in the water washing tank 4. At the same time, the spraying method can increase the contact area with the gas in the tank, further promoting the dissolution of water-soluble gases such as ammonia. The replenishment of aqueous solution keeps the liquid level in the tank submerged in the gas delivery pipe 8, thereby improving the exhaust gas treatment efficiency. The first float valve 6 can detect the liquid level in the water washing tank 4 in real time. When the liquid level drops, the signal is transmitted to the water washing tank 4, and water is replenished to the water washing tank 4 through the first sprayer 5.

[0020] In a further preferred embodiment, the first sprayer 5 is connected to the spray water storage tank 9 via an automatic valve 7. When water is replenished, the automatic valve 7 is opened, and the spray water stored in the spray water storage tank 9 is transported to the first sprayer 5 to replenish the water in the washing tank 4; the first float valve 6 is connected to the automatic valve 7.

[0021] More preferably, the automatic valve 7 is interlocked with the first float valve 6. The liquid level signal detected by the first float valve 6 is transmitted to the automatic valve 7. When the liquid level drops, the automatic valve 7 opens to replenish water. When the liquid level rises to a certain height, the automatic valve 7 closes to stop replenishing water.

[0022] More preferably, the tail end of the gas supply pipe 8 is provided with multiple small holes, which are 3-5 cm away from the bottom of the gas supply pipe 8 and have an inner diameter of 2-5 mm. The gas in the gas supply pipe 8 is discharged through the small holes. At the same time, the small holes are vertically distributed to prevent backflow and avoid safety accidents.

[0023] Preferably, the dehumidifier 14 is equipped with a multi-layer drawer-type activated carbon tank, which can perform multi-layer adsorption treatment on exhaust gas. At the same time, the drawer-type structure facilitates replacement and maintenance.

[0024] Preferably, the exhaust gas treatment tank 12 is connected to the concentrator 16 via pipeline, and the concentrator 16 is connected to the ammonia tank 1 via pipeline. The aqueous solution containing ammonia absorbed in the exhaust gas treatment tank 12 is concentrated and then transported to the ammonia tank 1 for recycling.

[0025] Preferably, the exhaust gas treatment tank 12 is equipped with a second sprayer 13 and a second float valve 17, which are used for spray water replenishment and liquid level detection in the exhaust gas treatment tank 12, respectively; the second sprayer 13 is connected to the spray water storage tank 9 pipeline, and the aqueous solution stored in the spray water storage tank 9 is replenished to the exhaust gas treatment tank 12 through the second sprayer 13, thereby increasing the contact area with the exhaust gas; the second float valve 17 is connected to the control valve of the second sprayer 13, and is used for liquid level detection and control of water replenishment timing and amount.

[0026] Preferably, the bottom of the stripping tower 11 is connected to the spray water storage tank 9 via pipeline, so that the aqueous solution of stripped ammonia gas is recovered into the spray water storage tank 9 for recycling.

Claims

1. A device for deodorizing the tail gas of an ammonia tank, characterized in that: The ammonia tank (1) is connected to the water washing system via the baffle plate demister (2) and the quartz sand filter (3). The bottom of the water washing system is connected to the stripping tower (11) via the tailwater tank (10). The stripping tower (11) is connected to the dehumidifier (14) via the tail gas treatment tank (12). The dehumidifier (14) is connected to the tail gas emission tower (15). The top of the water washing system is connected to the tail gas emission tower (15) via the dehumidifier (14).

2. The ammonia tank tail gas deodorization device according to claim 1, characterized in that: The washing system consists of multiple washing tanks (4) connected in series. Each washing tank (4) is equipped with an air supply pipe (8), a first sprayer (5), and a first float valve (6).

3. The ammonia tank tail gas deodorization device according to claim 2, characterized in that: The first sprayer (5) is connected to the spray water storage tank (9) via the automatic valve (7); the first float valve (6) is connected to the automatic valve (7).

4. The ammonia tank tail gas deodorization device according to claim 2, characterized in that: The gas pipe (8) has multiple small holes at its tail end. The small holes are 3-5 cm away from the bottom of the gas pipe (8) and have an inner diameter of 2-5 mm.

5. The ammonia tank tail gas deodorization device according to claim 1, characterized in that: The dehumidifier (14) is equipped with a multi-layer drawer-type activated carbon tank.

6. The ammonia tank tail gas deodorization device according to claim 1, characterized in that: The exhaust gas treatment tank (12) is connected to the concentrator (16) by pipeline, and the concentrator (16) is connected to the ammonia tank (1) by pipeline.

7. An ammonia tank tail gas deodorization device according to claim 1 or 6, characterized in that: The exhaust gas treatment tank (12) is equipped with a second sprayer (13) and a second float valve (17); the second sprayer (13) is connected to the spray water storage tank (9) by pipeline; the second float valve (17) is connected to the control valve of the second sprayer (13).

8. The ammonia tank tail gas deodorization device according to claim 1, characterized in that: The bottom of the stripping tower (11) is connected to the pipeline of the spray water storage tank (9).

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